a bigger water dish i believe can increase the humidity and keep it stable, and is there if your ball decides he wants to just soak or something im not sure but i always keep 2 water bowls one thats a nice decorated one, and then just a water dish large enough for him to fit inside of it

sometimes after my snake poops he will drag his tail into one water bowl not the other.. which is also good for me

hope this helps.. but this is my personal choice